Hisn al-Muslim: Aboe Dawoed (5088), at-Tirmidhie (3388), Ibn Maadjah (3869), Sahieh at-Targhieb wat-Tarhieb (655) et al

>بِسـمِ اللهِ الذي لا يَضُـرُّ مَعَ اسمِـهِ شَيءٌ في الأرْضِ وَلا في السّمـاءِوَهـوَ السّمـيعُ العَلـيم >In the Name of Allah, Who with His Name nothing can cause harm in the earth nor in the heavens, and He is the All-Hearing, the All-Knowing. I was wondering why you have to recite it 3 times in the morning and 3 times in the evening. Will there be a conflict of interest when you recite others dua that promise the same at the same time in the day? It has been widely regarded as an authentic hadith by the sources I have mentioned above. Thank you highly in advance.